The new JLG 1850SJ Ultra Boom rides on an X-shaped chassis. Photo by Tudor Van Hampton for ENR The Genie SX-180 at CONEXPO. Related Links: ENR's Full CONEXPO Coverage JLG Rolls Out Record-Breaking Boom Lift Genie, whose 180-foot SX-180 boom lift was recently eclipsed as the world's tallest by the 185-foot JLG 1850SJ Ultra Boom, has put its competitor on notice regarding possible patent infringement."We have some concerns because it appears to be similar in how it is executed." said Brad Allen, vice president of marketing, product management and engineering for Terex Corp.'s
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.